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Allan Hills A81208
Basic information Name: Allan Hills A81208
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81208
This meteorite may also be called Allan Hills 81208 (ALH 81208) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1.6 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 7(2)  (1984)  Diogenite/mesosiderite
AMN 17(1)  (1994)  Mesosiderite
Meteoritical Bulletin:  MB 76  (1994)  Mesosiderite
NHM Catalogue:  5th Edition  (2000)  Mesosiderite
MetBase:  v. 7.1  (2006)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 148 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Metal-rich meteorites, Mesosiderites
Writeuphelp
Writeup from AMN 7(2):

Sample No.: ALHA81208

Location: Allan Hills

Field No.: 1663

Weight (gms): 1.6

Meteorite Type: Diogenite/Mesosiderite

Physical Description: Roberta Score

Evaporite deposit coats the oxidized fusion crust that completely covers this meteorite. The interior is extensively weathered and the stone crumbled when it was chipped. Dimensions: 2.5 x 1 x 0.5 cm

 

Petrographic Description: Brian Mason

The thin section consists almost entirely of orthopyroxene clasts, ranging up to 3 mm in maximum dimension. Accessory chromite is present. The individual clasts are rimmed by dark brown to black material, which consists in part of limonite. Remnants of fusion crust are present, and have an outer crust of brown limonite. Microprobe analyses show that the pyroxene is essentially uniform in composition, except for some variation in calcium content (CaO 1.2-2.5%); mean composition is Wo3Fs25 (A12O3 0.7%, TiO2 0.14%, MnO 0.6%). The meteorite is classified as a diogenite, although the amount of limonite suggests that it may be a silicate fragment from a mesosiderite.

Data from:
  MB76
  Table 2
  Line 731:
Origin or pseudonym:Main icefield
Mass (g):1.6
Class:Meso
Weathering grade:Ce
Ferrosilite (mol%):25
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 7(2) (1984), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 41' 3"S, 159° 21' 27"E)
Note: the NHM and MetBase coordinates are 8.7 km apart

Statistics:
     This is 1 of 33406 approved meteorites from Antarctica (plus 6798 unapproved names)
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